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Scope:

This method describes the qualitative and the quantitative
determination of unmodified starches and starches modified only by
conventional oxidation techniques or enzyme conversion, which are
used for beater addition or surface sizing.

This procedure measures the total starch content and does not
differentiate between starch inside and on the surfaces of the
paper.

Some starches that are cationic, substituted, grafted, or
combined with resins are not within the scope of this procedure,
because special techniques are required for them. Test to determine
whether the starch is appropriate for this procedure by checking
for extractability. If it can be extracted quantitatively and forms
the iodine complex, it should be able to be determined by this
method.

This method is applicable only for papers with fully bleached
pulp, because lignin and lignin remnants can also react with iodine
to form a color complex.